/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.confignode.procedure.store;

import org.apache.iotdb.commons.conf.CommonDescriptor;
import org.apache.iotdb.confignode.consensus.request.write.procedure.DeleteProcedurePlan;
import org.apache.iotdb.confignode.consensus.request.write.procedure.UpdateProcedurePlan;
import org.apache.iotdb.confignode.manager.ConfigManager;
import org.apache.iotdb.confignode.manager.ConsensusManager;
import org.apache.iotdb.confignode.persistence.ProcedureInfo;
import org.apache.iotdb.confignode.procedure.Procedure;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.io.File;
import java.io.IOException;
import java.util.List;

public class ConfigProcedureStore implements IProcedureStore {

    private static final Logger LOG = LoggerFactory.getLogger(ConfigProcedureStore.class);

    private volatile boolean isRunning = false;
    private final ProcedureInfo procedureInfo;
    private final String procedureWalDir =
            CommonDescriptor.getInstance().getConfig().getProcedureWalFolder();
    private final ConfigManager configManager;

    public ConfigProcedureStore(ConfigManager configManager, ProcedureInfo procedureInfo) {
        this.configManager = configManager;
        this.procedureInfo = procedureInfo;
        try {
            checkProcWalDir(procedureWalDir);
        } catch (IOException e) {
            LOG.error("ConfigProcedureStore start failed ", e);
        }
    }

    public ConsensusManager getConsensusManager() {
        return configManager.getConsensusManager();
    }

    @Override
    public boolean isRunning() {
        return isRunning;
    }

    @Override
    public void setRunning(boolean running) {
        this.isRunning = running;
    }

    @Override
    public void load(List<Procedure> procedureList) {
        procedureInfo.load(procedureList);
    }

    @Override
    public void update(Procedure procedure) {
        UpdateProcedurePlan updateProcedurePlan = new UpdateProcedurePlan();
        ProcedureType procedureType = ProcedureFactory.getProcedureType(procedure);
        if (procedureType != null) {
            updateProcedurePlan.setProcedure(procedure);
        }
        getConsensusManager().write(updateProcedurePlan);
    }

    @Override
    public void update(Procedure[] subprocs) {
        for (Procedure subproc : subprocs) {
            update(subproc);
        }
    }

    @Override
    public void delete(long procId) {
        DeleteProcedurePlan deleteProcedurePlan = new DeleteProcedurePlan();
        deleteProcedurePlan.setProcId(procId);
        getConsensusManager().write(deleteProcedurePlan);
    }

    @Override
    public void delete(long[] childProcIds) {
        for (long childProcId : childProcIds) {
            delete(childProcId);
        }
    }

    @Override
    public void delete(long[] batchIds, int startIndex, int batchCount) {
        for (int i = startIndex; i < batchCount; i++) {
            delete(batchIds[i]);
        }
    }

    /**
     * clean all the wal, used for unit test.
     */
    public void cleanup() {
        // no op
    }

    public void stop() {
        isRunning = false;
    }

    @Override
    public void start() {
        if (!isRunning) {
            isRunning = true;
        }
    }

    private void checkProcWalDir(String procedureWalDir) throws IOException {
        File dir = new File(procedureWalDir);
        if (!dir.exists()) {
            if (dir.mkdirs()) {
                LOG.info("Make procedure wal dir: {}", dir);
            } else {
                throw new IOException(
                        String.format(
                                "Start ConfigNode failed, because couldn't make system dirs: %s.",
                                dir.getAbsolutePath()));
            }
        }
    }
}
